One Matched Pair (2 tubes), rare 6DJ8 ECC88 Amperex Made in Holland.
They are made in Philips Herlen tube plant in 60s, the same etched codes. Also the same codes printed on the bulbs.
Old type Gray electrostatic shield, double stage ring getter.
Tested NOS and carefully matched.
Tested for noise and microphonics in phono preamp.
Brand: Amperex
Type: NOS Tube
Country of Manufacture: Holland
Country/Region of Manufacture: Netherlands